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Note 4 - Fair Value of Financial Instruments Rollforward of Level III Assets and Liabilities Fair Value Disclosure (Details) (Fair Value, Inputs, Level 3, Fair Value, Measurements, Recurring, USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Financial Instruments, Net Liabilities [Member]
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Liabilities $ 343.6 $ 207.5 $ 254.9 $ 110.6
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities 11.4 [1] (41.0) [2] (69.7) [3] (146.9) [4]
Purchases Level III Liabilities 0 0 0 0
Sales Level III Liabilities 0 0 0 0
Issuances Level III Liabilities 0 0 0 0
Settlements Level III Liabilities (5.3) (5.8) (12.9) 3.2
Transfers Into (Out of) Level III Liabilities 0 [5] 0 [5] 0 [5] 0 [5]
Ending Balance Level III Liabilities 337.5 254.3 337.5 254.3
Unrealized Gains (Losses) Recorded in Earnings on Level III Liabilities Still Held 5.9 (48.0) (83.5) (188.3)
Variable Interest Entity, Primary Beneficiary [Member]
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Liabilities 106.8 107.8 108.9 228.2
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities (1.8) [1] (6.8) [2] (9.0) [3] (111.2) [4]
Purchases Level III Liabilities 0 0 0 0
Sales Level III Liabilities 0 0 0 0
Issuances Level III Liabilities 0 0 0 0
Settlements Level III Liabilities 4.4 4.9 13.7 229.7 [6]
Transfers Into (Out of) Level III Liabilities 0 [5] 0 [5] 0 [5] 0 [5]
Ending Balance Level III Liabilities 104.2 109.7 104.2 109.7
Unrealized Gains (Losses) Recorded in Earnings on Level III Liabilities Still Held (1.0) (5.8) (6.4) (12.9)
Total Level III liabilities net [Member]
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Liabilities 450.4 315.3 363.8 338.8
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities 9.6 [1] (47.8) [2] (78.7) [3] (258.1) [4]
Purchases Level III Liabilities 0 0 0 0
Sales Level III Liabilities 0 0 0 0
Issuances Level III Liabilities 0 0 0 0
Settlements Level III Liabilities (0.9) (0.9) 0.8 232.9
Transfers Into (Out of) Level III Liabilities 0 [5] 0 [5] 0 [5] 0 [5]
Ending Balance Level III Liabilities 441.7 364.0 441.7 364.0
State and municipal obligations
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 19.4 19.6 19.0 62.5
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 0.4 [1] 0.4 [2] 0.8 [3] (3.6) [4]
Purchases Level III Assets 0 0 0 0
Sales Level III Assets 0 0 0 0
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 1.4 1.2 1.4 12.3
Transfers Into (Out of) Level III Assets 0 [5] 0 [5] 0 [5] (27.8) [5],[7]
Ending Balance Level III Assets 18.4 18.8 18.4 18.8
Corporate Debt Securities
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets     0  
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings     (0.1) [3]  
Purchases Level III Assets     2.7  
Sales Level III Assets     0  
Issuances Level III Assets     0  
Settlements Level III Assets     0  
Transfers Into (Out of) Level III Assets     (2.6) [5],[7]  
Ending Balance Level III Assets 0   0  
RMBS
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets       45.5
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings       6.1 [4]
Purchases Level III Assets       0
Sales Level III Assets       0
Issuances Level III Assets       0
Settlements Level III Assets       51.6
Transfers Into (Out of) Level III Assets       0 [5]
Ending Balance Level III Assets   0   0
CMBS
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets     0 35.4
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings     0 [3] (11.4) [4]
Purchases Level III Assets     3.1 0
Sales Level III Assets     3.1 0
Issuances Level III Assets     0 0
Settlements Level III Assets     0 24.0
Transfers Into (Out of) Level III Assets     0 [5] 0 [5]
Ending Balance Level III Assets 0 0 0 0
CDO
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets       5.5
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings       0.8 [4]
Purchases Level III Assets       0
Sales Level III Assets       0
Issuances Level III Assets       0
Settlements Level III Assets       6.3
Transfers Into (Out of) Level III Assets       0 [5]
Ending Balance Level III Assets   0   0
Other ABS
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 1.2 4.8 1.7 2.9
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 0 [1] 0 [2] 0 [3] 0.8 [4]
Purchases Level III Assets 0 0 0 5.2
Sales Level III Assets 0 0 0 0
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0.2 0.5 0.7 4.6
Transfers Into (Out of) Level III Assets 0 [5] (4.3) [5],[7] 0 [5] (4.3) [5],[7]
Ending Balance Level III Assets 1.0 0 1.0 0
Hybrid securities
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets       4.8
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings       0.1 [4]
Purchases Level III Assets       0.1
Sales Level III Assets       4.9
Issuances Level III Assets       0
Settlements Level III Assets       0
Transfers Into (Out of) Level III Assets       (0.1) [5],[7]
Ending Balance Level III Assets   0   0
Equity securities
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 0.4 2.0 1.0 0.8
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 0 [1] (0.4) [2] 0 [3] 0.1 [4]
Purchases Level III Assets 0 0 0 0
Sales Level III Assets 0 0.1 0.6 0.1
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 0 0 0
Transfers Into (Out of) Level III Assets 0 [5] 0.1 [5] 0 [5] 0.8 [5]
Ending Balance Level III Assets 0.4 1.6 0.4 1.6
Other investments
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 77.4 76.5 79.0 6.8
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 2.3 [1] (0.6) [2] 0.4 [3] 0.6 [4]
Purchases Level III Assets 0.5 0.9 1.3 75.9
Sales Level III Assets 0 0.1 0.1 0.6
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 0 0.4 6.0
Transfers Into (Out of) Level III Assets 0 [5] 0 [5] 0 [5] 0 [5]
Ending Balance Level III Assets 80.2 76.7 80.2 76.7
Investments
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 98.4 102.9 100.7 164.2
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 2.7 [1] (0.6) [2] 1.1 [3] (6.5) [4]
Purchases Level III Assets 0.5 0.9 7.1 81.2
Sales Level III Assets 0 0.2 3.8 5.6
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 1.6 1.7 2.5 104.8
Transfers Into (Out of) Level III Assets 0 [5] (4.2) [5] (2.6) [5] (31.4) [5]
Ending Balance Level III Assets 100.0 97.1 100.0 97.1
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held 2.3 (1.1) 0.4 (0.1)
NIMS Derivatives
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 1.6 1.7 1.6 1.6
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 0 [1] 0 [2] 0 [3] 0 [4]
Purchases Level III Assets 0 0.1 0 0.2
Sales Level III Assets 0 0 0 0
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 0 0 0 0
Transfers Into (Out of) Level III Assets 0 [5] 0 [5] 0 [5] 0 [5]
Ending Balance Level III Assets 1.6 1.8 1.6 1.8
Other Assets
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 96.0 100.7 99.2 104.0
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 2.7 [1] 6.1 [2] 11.1 [3] 15.4 [4]
Purchases Level III Assets 0 0 0 0
Sales Level III Assets 0 0 0 0
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 5.5 6.2 17.1 18.8
Transfers Into (Out of) Level III Assets 0 [5] 0 [5] 0 [5] 0 [5]
Ending Balance Level III Assets 93.2 100.6 93.2 100.6
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held 0.5 3.5 3.9 7.3
Total Level III Assets
        
Fair Value Level III Assets and Liabilities [Roll Forward]        
Beginning Balance Level III Assets 196.0 205.3 201.5 269.8
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 5.4 [1] 5.5 [2] 12.2 [3] 8.9 [4]
Purchases Level III Assets 0.5 1.0 7.1 81.4
Sales Level III Assets 0 0.2 3.8 5.6
Issuances Level III Assets 0 0 0 0
Settlements Level III Assets 7.1 7.9 19.6 123.6
Transfers Into (Out of) Level III Assets 0 [5] (4.2) [5] (2.6) [5] (31.4) [5]
Ending Balance Level III Assets $ 194.8 $ 199.5 $ 194.8 $ 199.5
[1] Includes unrealized gains (losses) for the quarter ended September 30, 2013, relating to assets and liabilities still held at September 30, 2013 as follows: $2.3 million for investments, $0.5 million for other assets, $5.9 million for derivative liabilities and $(1.0) million for VIE debt.
[2] Includes unrealized gains (losses) for the quarter ended September 30, 2012, relating to assets and liabilities still held at September 30, 2012 as follows: $(1.1) million for investments, $3.5 million for other assets, $(48.0) million for derivative liabilities, and $(5.8) million for VIE debt.
[3] Includes unrealized gains (losses) for the nine months ended September 30, 2013, relating to assets and liabilities still held at September 30, 2013 as follows: $0.4 million for investments, $3.9 million for other assets, $(83.5) million for derivative liabilities and $(6.4) million for VIE debt.
[4] Includes unrealized gains (losses) for the nine months ended September 30, 2012, relating to assets and liabilities still held at September 30, 2012 as follows: $(0.1) million for investments, $7.3 million for other assets, $(188.3) million for derivative liabilities, and $(12.9) million for VIE debt.
[5] Transfers are recognized at the end of the period as the availability of market observed inputs change from period to period.
[6] Primarily represents the settlement of our CDO of ABS.
[7] During the period, pricing from a third-party pricing source became available that utilized observable inputs for individual instruments. As a result, these instruments were transferred out of Level III and into Level II.